Diego Costa must be charged and banned by the Football Association for slapping Laurent Koscielny in the incident which preceded Costa's prolonged clash with Gabriel Paulista which resulted in the Arsenal player being sent off.

The dismissal was a silly one for Arsenal's Brazilian who was wound up by Chelsea's centre forward and Mike Dean had to show the red card when he saw Gabriel's petulant kick at Costa.

Dean will be disappointed that he missed the main incident between Costa and Koscielny - given the disciplinary action he took it is safe to assume that it occurred away from his view.

Diego Costa must be charged and banned by the Football Association for slapping Laurent Koscielny

After watching Costa push his team-mate, Gabriel makes his way towards Costa to confront the striker

Costa vents his anger at defender Koscielny and prepares to confront the defender at the end the first half

After competing for the ball in the Arsenal box, Costa and Koscielny confront each other

Gabriel and Costa face-off as the defender takes exception to the striker's behaviour against his team-mate

Costa appeared to catch Koscielny in the face and not content with that he then clearly slapped the Arsenal man when confronted by him.

That caused Gabriel to get involved and Costa knocked him to the ground with an aggressive shove with his chest.